TERRAPUB Earth, Planets and Space

Earth Planets Space, Vol. 60 (No. 4), pp. 277-281, 2008

Instrumentation and performance evaluation of the XRS on SELENE orbiter

K. Shirai1, T. Okada1, Y. Yamamoto1, T. Arai1, K. Ogawa1,2, H. Shiraishi1, M. Iwasaki1,2, M. Arakawa3, M. Grande4, and M. Kato1,2

1Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency, 3-1-1 Yoshinodai, Sagamihara, Kanagawa 229-8510, Japan
2Department of Earth and Planetary Sciences, Tokyo Institute of Technology, 2-12-1 Ookayama, Tokyo 152-8551, Japan
3Graduate School of Enviromental Studies, Nagoya University, Furo-cho, Chikusa-ku, Nagoya 464-8602, Japan
4Institute of Mathematical and Physical Sciences, University of Wales, Aberystwyth, Ceredigion, SY23 3BZ, Wales, UK

(Received May 8, 2007; Revised October 15, 2007; Accepted November 10, 2007; Online published April 9, 2008)

Abstract: The x-ray fluorescence spectrometer (XRS) on board Japanese lunar polar orbiter SELENE (Kaguya) will provide global distribution of major elemental composition on the lunar surface in energy range of characteristic K-α x-ray line emission for Mg, Al, Si, Ca, Ti, and Fe. These measurements will contribute to research of lunar origin and its evolution. The XRS shows a good energy resolution within 200 eV at 5.9 keV relying on charge coupled device (CCD) as photon energy dispersive detector. Total collective area of 100 cm2 for main detector facing the lunar surface is composed of 16 CCD chips. Instrumentation of the XRS and its performance evaluated in laboratory are presented.
Key words: X-ray fluorescent spectrometry, global mapping, Moon, charge coupled device.

Corresponding author E-mail: shirai@planeta.sci.isas.jaxa.jp

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